Engine



FIG. 1 is a front, left, upper perspective view of an engine showing our new design;

FIG. 2 is a rear, right, lower perspective view thereof:

FIG. 3 is a front view thereof

FIG. 4 is a rear side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom side view thereof.

The broken lines shown in the drawings illustrate portions of the engine that form no part of the claimed design. 

CLAIM The ornamental design for an engine, as shown and described. 